Humphreys Hitch and Trailer Parts
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How To's And Guides






Definition Of Tire Terms

Design Rim Width: The specific rim width assigned to each tire size designation, to determine basic tire dimensions. Tire Dimensions
Section Width: The maximum width of a new tire.
Overall Diameter: The diameter of an inflated tire at the outer most surface of the tread.
Maximum Load Capacity: The maximum weight a tire is designed to carry, under standard use conditions.

Load Identification:

Load Range identified with a letter (A, B, C, etc.)
Standard Load and Extra Load: Used to identify a given size tire with its load and inflation limits, when used in a specific type of service.

Ply Rating: Used to identify a given tire with its maximum recommended load, when used in a specific type of service. It is an index of tire strength and does not necessarily represent the number of cord plied in the tire.

Static Load Radius: The dimensions from the bottom of the tire to the center line of an axle, when the tire is loaded at its rated capacity.

How The Tire Part Number System Works:

Part numbers incorporate tire sizes and descriptions, to allow you to easily determine the tires you need to order. For example, part numbers 7516BE and ST205-75-R15BC-I can be interpreted as follows:
  • 7526 = 7.50 X 16
  • B = Blackwall
  • E = Load Range E
  • ST205-75-R15 = ST205-17-15 Radial
  • B = Blackwall
  • C = Load Range C

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